OX40 Antibody Host:Rabbit Antibody Type:Polyclonal Species Reactivity:Rat Application:Western blot Western blotting (0.5-4 μg/ml). However, the optimal concentrations should be determined individually. The antibody recognizes the 50 kDa full length as well as the 30 kDa and 20 kDa subunits of OX40 in Western blot analysis. Reacts with rat. Other species have not been determined.